中国激光, 2014, 41 (1): 0103007, 网络出版: 2013-12-24
2198-T851铝锂合金激光焊接工艺研究
Laser Beam Welding Study of 2198-T851 Aluminum-Lithium Alloy
激光技术 激光焊接 铝锂合金 裂纹 焊接工艺 组织性能 laser technique laser welding aluminum-lithium alloy cracking welding process microstructure property
摘要
铝锂合金被认为是在航空航天领域中实现飞行器轻量化的理想结构材料之一。采用高功率光纤激光器焊接1.76 mm厚的2198-T851铝锂合金,研究填充ER4047焊丝时激光功率、焊接速率和送丝速率对焊接热裂纹和焊缝组织的影响,以及最优焊接工艺下焊接接头的显微组织与力学性能。结果表明,当激光功率为4 kW,焊接速率为4 m/min,送丝速率为4 m/min时,填充ER4047焊丝焊接可获得成形良好且无宏观裂纹缺陷的焊接接头。接头的平均抗拉强度为342 MPa,拉伸断裂后接头断裂强度达到母材的65.4%,熔合区为薄弱部位。
Abstract
Aluminum-lithium alloys are considered to be one of the most ideal light-weight materials for aerospace applications. 2198-T851 with thickness of 1.76 mm is welded with filler wire ER4047 by using a high power fiber laser. The effects of the laser power, welding speed and wire feeding velocity on solidification cracking susceptibility and microstructures are investigated, as well as the joint microstructure and mechanical properties under the optimal welding process. The results indicate that a joint with good surface appearance and no hot crack is obtained with the optimal welding parameters of 4 kW laser power, 4 m/min welding speed and 4 m/min wire feeding velocity. The average tensile strength of joints is 342 MPa, and reaches 65.4% of the tensile strength of base metal. The bond is the weakness region of the joint.
林凯莉, 杨武雄, 吕俊霞, 肖荣诗. 2198-T851铝锂合金激光焊接工艺研究[J]. 中国激光, 2014, 41(1): 0103007. Lin Kaili, Yang Wuxiong, Lü Junxia, Xiao Rongshi. Laser Beam Welding Study of 2198-T851 Aluminum-Lithium Alloy[J]. Chinese Journal of Lasers, 2014, 41(1): 0103007.